The Sharra-IV was a Shi'ar monitoring station orbiting around and observing the Great K'ythri, a wormhole connected to the Exo-Space.
When Thanos came out of said wormhole, he assaulted the Sharra-IV.
- Sharra-IV and the wormhole it observes, the Great K'ythri, are seemingly named after the deities Sharra and K'ythri, who are responsible for the creation of the universe in the Shi'ar mythology.
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